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Soft chemical method for synthesizing soft magnetic ferrite

A soft ferrite and soft chemistry technology, applied in the direction of magnetic properties of inorganic materials, can solve the problems of uneven mixing of components, high sintering temperature, and difficult co-firing.

Inactive Publication Date: 2010-03-03
李建军 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of uneven mixing of components, high sintering temperature and difficulty in co-firing with electrodes in the process of preparing soft ferrite, and to provide a soft ferrite synthesized by soft chemical method and its preparation method

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  • Soft chemical method for synthesizing soft magnetic ferrite
  • Soft chemical method for synthesizing soft magnetic ferrite
  • Soft chemical method for synthesizing soft magnetic ferrite

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specific Embodiment approach 1

[0008] Specific embodiment one: the soft magnetic ferrite precursor that the soft chemical method of present embodiment is synthesized [will stir good metal element trivalent iron (Fe 3+ ), divalent metal elements M or N (M, N=Fe, Mn, Zn, Ni, Cu and other divalent metal elements) mixed with citric acid and obtained by rotary evaporation to remove water] from sol to gel state as shown in the figure 1.

[0009] The precursor of the soft ferrite in this embodiment is a sol, which is cured into a gel after heat treatment at 100 degrees. The gel is very brittle and turns into a solid powder with a little force.

specific Embodiment approach 2

[0010] Specific embodiment two: The soft magnetic ferrite synthesized by the soft chemical method of this embodiment has M x N 1-x Fe 2 o 4 (0≤x≤1, and M, N=Fe, Mn, Zn, Ni, Cu and other divalent metal elements) molecular formula of spinel or inverse spinel structure; element M or N can represent a single metal element, or Can represent two metal elements.

[0011] In this embodiment, the particle size of the soft ferrite in this embodiment is on the order of nanometers, and most of them have superparamagnetism at room temperature. In this embodiment, the divalent metal elements M or N are mixed in any proportion.

specific Embodiment approach 3

[0012] Specific embodiment three: the soft magnetic ferrite synthesized by the soft chemical method of the present embodiment has Mn x Cu 1-x Fe 2 o 4 (x = 1, 0.8) Molecular structure. The raw material iron nitrate [Fe(NO 3 ) 3 9H 2 O] Manufacturer: Beijing Chemical Reagent Factory; Manganese Nitrate [Mn(NO 3 ) 2 50% aqueous solution]: Shenyang Reagent Factory; citric acid [C 6 h 8 o 7 ·H 2 O]: Shenyang Xinxi Reagent Factory. The phase structure (XRD spectrum) is measured by German Siemens D5005 X-ray diffractometer, Cu target (λ=0.15418nm, tube pressure is 30kV, tube current 30mA) scan rate 1° / min, the size of soft ferrite is broadened by Calculated from the half width of the X-ray diffraction peak (Debye-Scherrer formula).

[0013] The MnFe prepared by this embodiment 2 o 4 and Mn 0.8 Cu 0.2 Fe 2 o 4 The powder X-ray diffraction spectrum (Fig. 2) of the sample, as can be seen from the figure, the position and intensity of the diffraction peaks are all the ...

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Abstract

The invention adopts a soft chemical method, takes citric acid as a carrier, adjusts the components used for preparing the soft magnetic ferrite and controls sintering program and sintering temperature so as to prepare a high-end ferrite product that meets the requirement of the market. The method solves the defect that in the prior art, the ferrite is not easy to be sintered under a relatively low temperature, and realizes the sintering of the ferrite magnetic medium under the low temperature, thus facilitating the cofiring with an electrode. The preparation method for synthesizing the soft magnetic ferrite by the soft chemical method comprises the following steps of: (1) dispersing; (2) mixing; (3) evaporating and solidifying; and (4) sintering. The soft chemical method takes the citricacid as the carrier to synthesize the soft magnetic ferrite and has the advantages of low sintering temperature, easy regulation of components, controllable performance of product, and capability of realizing the cofiring with the electrode at the relatively low temperature.

Description

technical field [0001] The invention relates to a soft magnetic ferrite and a preparation method thereof. Background technique [0002] Soft magnetic ferrite is widely used in the electronic information industry. It is a magnetic material with the most varieties, the widest application and the largest consumption. It is an important basic functional material in the electronic information and home appliance industries. After more than half a century of scientific research and production by ferrite companies in various countries, the performance of soft ferrite in the world has been greatly improved and enhanced. Its output has increased rapidly year by year, and the scope of application fields has continued to expand. In the next few years, the development of China's 3G standard mobile phones will become the focus, and the output will exceed that of the GSM standard. Due to the increase of functions and the improvement of technology, higher requirements are put forward for t...

Claims

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Application Information

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IPC IPC(8): H01F1/37C04B35/26C04B35/624C04B35/64
Inventor 李建军曹军刚
Owner 李建军
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